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D... |
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Image forming method and image forming apparatus
| Details |
Inventors: Yusa, Hiroshi; Tomiyama, Kohichi; Kato, Masayoshi; Kukimoto, Tsutomu; Tsuchiya, Kiyoko;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Goodrow; John
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
An electrostatic image supporting member which supports an electrostatic image and a toner carrying member for conveying a magnetic toner are disposed in a development section with a specified gap therebetween. The toner carrying member has a base whose surface has an average surface roughness (Ra) of 1.0 to 3.0 .mu.m. A resin coating containing electrically conductive fine particles is formed on the base surface at a density of 4 to 12 g per 1 m.sup.2. The outer layer of the coating has an Ra from 0.8 to 3.0 .mu.m. The toner carrying member carries an electrically insulating magnetic toner containing at least a binder resin and a magnetic component, and satisfying the conditions of a volumetric average particle size of 4.5 to 8 .mu.m, a BET specific surface area of 1.8 to 3.5 m.sup.2 /g, a charge amount of -20 to -35 .mu.c/g, a loose-state apparent density of 0.40 to 0.52 g/cm.sup.3, and a true specific gravity of 1.45 to 1.8. The magnetic toner is formed into a layer having a thickness smaller than the dimension of the gap by a member for regulating the thickness by pressing the toner against the toner carrying member. The magnetic toner is then conveyed to the development section, in which the toner develops the electrostatic image while an AC electric field is applied. |
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DETAILED DESCRIPTION An object of the present invention is to provide an image forming method and an image forming apparatus adapted to perform development of the above-described type for a long period of time and capable of ensuring that the magnetic toner is uniformly spread on the toner carrying member and that the contamination of the surface of the toner carrying member with a magnetic toner or component(s) thereof is prevented or reduced.
Another object of the present invention is to provide an image forming method and an image forming apparatus that, for long periods of time, is capable of assuring that high-quality images having high image densities, with excellent fine-line reproduction, and being clear and free of fog are obtained.
A further object of the present invention is to provide an image forming method and an image forming apparatus whose level of performance is not changed by variations in the environmental conditions.
In order to achieve the above objects, according to the present invention, there is provided an image forming method, comprising: (a) disposing an electrostatic image supporting member supporting an electrostatic image thereon and a toner carrying member for conveying a magnetic toner on the surface thereof in a development section with a predetermined gap between the members, wherein (i) the toner carrying member includes a base whose surface has irregularities with an average surface roughness (Ra) of 1.
0 to 3.
0 .
mu.
m, and a resin coating on the surface of the base having a density of 4 to 12 g per 1 m.
sup.
2, the resin coating containing electrically conductive fine particles and an outer layer of the resin coating having an Ra from 0.
8 to 3.
0 .
mu.
m; and (ii) the magnetic toner is an electrically insulating magnetic toner containing at least a binder resin and a magnetic component, the magnetic toner satisfying the conditions of a volumetric average particle size of 4.
5 to 8 .
mu.
m, a BET specific surface area of 1.
8 to 3.
5 m.
sup.
2 /g, a charge amount of -20 to -35
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Molecular Biology 
